PECULIARITIES OF THE THYROID-GLAND STRUCTURE (WITH SPECIAL REFERENCE TO THE PRESENCE OF GANGLION-CELLS)

We have performed a study on the comparative structure of the thyroid gland in several species of mammals (rat, cat, dog, lamb, pig, cow, an d man). We have described the structural differences among them, payin g special attention to the distribution of connective tissue, the intr afollicular and parafollicular cells. In the thyroid gland, we can con firm the existence of nerve cells, either isolated or forming vegetati ve ganglions in the interfollicular spaces, in some of the species stu died, especially in the rat and the dog.